Quick meaning
A handheld device moved on a flat surface to control the on-screen pointer.
Think of it like this
Like a remote control for your computer cursor.
Where you may see this
You may hear this when buying a device, asking for repairs, or checking phone and computer settings.
Why it matters
Understanding the hardware term helps you choose the right device and explain problems more clearly when asking for help.
Say it simply
Mouse means: A handheld device moved on a flat surface to control the on-screen pointer.